The table below shows the activities, immediate predecessors, and activity durations of a project.

$\backslash$table$[[$Activity$,$Immediate Predecessor$($s$),$Time $($days$)],[$A$,-,9],[$B$,$A$,7],[$C$,$A$,3],[$D$,$B$,6],[$E$,$B$,9],[$F$,$C$,4],[$G$,$E F$,6],[$H$,$D$,5],[$I$,$G$,3]]$

$($a$)$ Choose all the activities in the critical path.

A

B

C

D

E

F

G

H

I